US20130265376A1 - Inkjet Compositions For Forming Functional Glaze Coatings - Google Patents

Inkjet Compositions For Forming Functional Glaze Coatings Download PDF

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Publication number
US20130265376A1
US20130265376A1 US13/911,107 US201313911107A US2013265376A1 US 20130265376 A1 US20130265376 A1 US 20130265376A1 US 201313911107 A US201313911107 A US 201313911107A US 2013265376 A1 US2013265376 A1 US 2013265376A1
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Prior art keywords
inkjet composition
composition according
inkjet
effect
ceramic
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US13/911,107
Inventor
Ana-Belén Gil-Torrente
Eugenio Silvestre-Lasa
Francisco-Javier Guaita-Delgado
Javier Gimeno-Navarro
Jose Manrique-Navarro
Juan Uso-Villanueva
Juan-Carlos Gallart-Pedro
Manuela Sales-Segarra
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Vibrantz Corp
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Ferro Corp
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Publication of US20130265376A1 publication Critical patent/US20130265376A1/en
Priority to PCT/US2014/037423 priority patent/WO2014197165A1/en
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Assigned to PNC BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT reassignment PNC BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FERRO CORPORATION
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks

Definitions

  • the present invention provides inkjet compositions that can be used to modify the physical properties of the surface of glass and ceramic substrates and thus provide a functional coating or glaze after firing.
  • the present invention provides inkjet compositions that can be used to modify the physical properties of the surface of glass and ceramic substrates and thus provide a functional coating or glaze after firing.
  • the physical properties of the ceramic article that can be changed or modified with the inkjet compositions of the present invention can affect various attributes of the ceramic article after firing, including: gloss, matt, contrast gloss (luster), specular reflection (metallic appearance), relief and slipperiness.
  • the inkjet compositions according to the invention include solvents, additives for dispersion, and inorganic substances.
  • the inorganic substances contained in the inkjet compositions are the responsible for the above mentioned effects on the surface of the ceramic article.
  • the inorganic substance may be a specific frit, a crystalline oxide, or a combination of frits and crystalline oxides.
  • the inkjet compositions of the present invention may be used in conjunction with a variety of substrates including, for example: ceramic tiles (e.g., floor tile, wall tile etc.); dinnerware; brick tiles; glass; enameled steel; enameled cast iron; and enameled aluminum.
  • ceramic tiles e.g., floor tile, wall tile etc.
  • dinnerware e.g., dinnerware
  • brick tiles e.g., glass
  • enameled steel e.g., enameled cast iron
  • enameled aluminum e.g., aluminum
  • FIG. 1 is a chart showing various inkjet technologies suitable for use with inkjet compositions according to the invention.
  • FIG. 2 is a graph showing the X-ray characterization of a ceramic tile to which an ink composition according to the invention has been applied.
  • Inkjet compositions according to the invention can be applied using inkjet decoration machines commonly used glazing lines of the above mentioned substrates. Also, inkjet plotter machines are commercially available, which permit the inkjet compositions to be used in a discontinuous way.
  • Inkjet machines may be used in simple-pass or multi-pass operating mode.
  • the simple-pass mode the inkjet print head makes only one-pass over the surface of the substrate.
  • the multi-pass mode the inkjet print head makes more than one-pass over the surface of the substrate. In some cases, several passes are needed on order to achieve the desired properties.
  • inkjet print head technologies are suitable for use with inkjet compositions according to the present invention.
  • Drop-on-demand technology is the most commonly employed technology in the ceramic industry.
  • Various inkjet technologies suitable for use with the present invention are shown in FIG. 1 .
  • inkjet inks are utilized to provide coloration to the ceramic substrate when fired.
  • conventional inkjet inks include solvents, dispersants and color-producing substances, which are typically ceramic pigments.
  • the current ceramic pigments used in inkjet inks include zircon praseodymium yellow zircon, zinc iron chromite brown, cobalt aluminate blue, chrome tin pink sphene, iron cobalt chromite black spinel, etc.
  • the inkjet compositions according to the present invention preferably do not contain any color-producing ceramic pigments. Instead, they contain inorganic substances that, although milled below 10 micron size so as to be capable of being ink-jet printable and being applied as very low deposits, are applied to modify targeted physical properties of the ceramic surface on which they are applied. Modification of the physical properties of the ceramic substrate can affect various attributes of the ceramic article after firing, including: gloss, matt, contrast gloss (luster), specular reflection (metallic appearance), relief and slipperiness.
  • inkjet technology provides the advantage of being able to apply the inkjet compositions in a determined place with high accuracy. So, the change of physical properties of the surface of the tile may follow an accurate pattern, opening new possibilities for tile decoration. It is seen as an advantage to combine the application of inkjet compositions according to the invention with the conventional pigmented inkjet inks. In this way, the ceramic article may be fully decorated using inkjet technology.
  • One object of the present invention is to develop a set of inkjet compositions having a completely distinct nature compared to current pigmented inkjet inks.
  • Inkjet compositions according to the invention are capable of being applied using conventional inkjet printing equipment without clogging the spray nozzles.
  • the preferable have appropriate physical properties, such as a viscosity within the range of from about 5 to about 50 mPa ⁇ s, a surface tension of from about 20 to about 40 mN/m, and a density of from about 0.8 to about 1.5 g/mL.
  • the inkjet compositions according to the invention preferably exhibit little or no volatility, and are stable with the materials used to make inkjet printing systems (e.g., print heads, nozzles, delivery lines etc.).
  • the inkjet compositions according to the invention work with the requirements of ceramic systems.
  • they must be capable of developing the desired surface affect (i.e., the desired physical surface change) after firing.
  • The must be capable of interacting with the glazed surface to become part of it.
  • They must contain sufficient solids to allow reasonable productivity. And, they must allow for enough resolution despite the large amount to be deposited.
  • the quantity of the inkjet compositions according to the invention deposited on the surface of the ceramic substrate will depend on the type of effect desired.
  • the inkjet compositions according to the invention can be applied over a wide range of application rates, from about 5 up to about 500 g/m 2 , depending upon the desired affect. Typical application rates are used in the Examples below.
  • the affects can be obtained using the disclosed inkjet compositions.
  • the affects are provided mainly by the presence of a particular solid in the inkjet composition.
  • the inkjet composition contains a solvent or diluent, a dispersant and the solid that creates the effect.
  • the solid is dispersed in a solvent or diluent wherein the diluent is a single phase liquid comprising several solvents.
  • This diluent can comprise aliphatic and/or aromatic hydrocarbon components as well as glycols, glycolethers, ethers, esters, alcohols, amides and/or water.
  • the diluent should have a boiling point of at least 100° C., and preferably at least 200° C.
  • the diluent as only one component or a combination of several ones, greatly determines the surface tension of the final ink, and thus it should have a surface tension within the print head requirements.
  • dispersant it is often necessary to include a dispersant to effectively disperse the solid particles into the diluent and stabilize the dispersion.
  • the dispersant must be capable of helping the process of grinding and stabilizing a dispersion of the solid in the required concentration into the chosen diluent at least under the operating conditions of the printing.
  • Polymeric dispersants are preferred because of their efficiency.
  • suitable dispersant are polyester amine dispersants (e.g. those sold by Lubrizol under the trade name of SOLSPERSE).
  • dispersants that may be used are those marketed under the names EFKA and DISPERBYK. Mixtures of dispersants may be used if desired.
  • dispersant For a given combination of diluent, dispersant and solid, the appropriate amount of dispersant may readily be determined by experiment.
  • the ideal amount of dispersant is typically that which gives the minimum viscosity of the dispersion.
  • the suitable amount of dispersant(s) varies depending on the specific surface area and the nature of the solid and will be found to lie in a very broad range, e.g. from about 5 to about 100% by weight of solid; larger amount of dispersant may be possible as well.
  • the viscosity is determined largely by the viscosity of the diluent and the nature and concentration of the dispersant and solid. Generally, the typical viscosity range is from about 5 to about 50 mPa s, measured at the temperature of jetting.
  • the dispersant is dissolved into the diluent and then the solid is added with stirring. After good dispersion is obtained, this slurry is milled using a conventional horizontal bead mill until the appropriate particle size distribution is obtained. The product is filtered to ensure that there is no coarse material or large agglomerates in the final suspension or inkjet composition.
  • the solid component is a recently developed frit, which develops a matt effect (hereinafter sometimes referred to as a “matt frit”).
  • the composition of the matt frit is shown in Table 1 below (weight percent):
  • the matt frit once fired, exhibits a high resistance to chemical and physical attack. It also exhibits a high softening point. This allows the matt frit to not be attacked by conventional glazes, and the matt effect remains, essentially floating on the surface of the glazed tile. Decorative effects such as 3-D effects can thus be obtained. Furthermore, the matt frit does not modify substantially the color development of conventional ceramic pigment-containing inkjet inks.
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the inkjet composition was filtered throughout a 2.4 pm absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 3 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 10 g/m 2 . Once fired, the ceramic substrate exhibited a matt effect.
  • Applicant has also developed an inkjet composition that provides a gloss effect when fired on the ceramic tile.
  • the solid component of the inkjet composition is a frit, which develops a glossy surfaces on ceramic tiles (hereinafter sometimes referred to as a “gloss frit”).
  • the composition of the gloss frit is shown in Table 4 below (weight percent):
  • the gloss frit exhibits a low softening point, and does not produce surface defects on glazed ceramic surfaces, such as pinholes or bubbles, which are commonly associated with the use of excess flux. It does not substantially modify the color development of the conventional ceramic pigment-containing inkjet inks.
  • An inkjet composition according to the invention was prepared with the composition shown in Table 5 below (parts by weight):
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the ink is filtered throughout a 2.4 ⁇ m absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 6 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 100 g/m 2 . Once fired, the ceramic substrate exhibited a glossy effect.
  • Applicant has also developed an inkjet composition that provides an anti-slip effect when fired on the ceramic tile.
  • the solid component of the inkjet composition comprises both a highly sintered a-alumina a glass frit.
  • the crystals of highly sintered a-alumina are believed to be responsible for the high slip resistance.
  • the glass frit is needed to provide proper bonding of the a-alumina crystals to the surface of the tile after firing.
  • frit that can be used is the matt frit previously described above.
  • An inkjet composition according to the invention was prepared with the composition shown in Table 7 below (parts by weight):
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the ink is filtered throughout a 2.4 ⁇ m absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 8 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 100 g/m 2 . Once fired, the ceramic substrate exhibited high slip resistance, when applied over a glossy glaze or a matt glaze. It also exhibited a smooth surface, high transparency, high acid resistance and did not substantially modify the color development of conventional ceramic pigment-containing inkjet inks.
  • Table 9 summarizes the results of slip-resistance, acid resistance, and surface abrasion resistance of anti-slip ink compositions applied to matt and glossy glazes:
  • Applicant has also developed an inkjet composition that provides a penetrating effect when fired on the ceramic tile.
  • the following inkjet composition made in accordance with the present invention displays a penetrating effect on the surface of the ceramic tile after firing.
  • the penetrating effect consists of a local depression of the surface of the ceramic tile. This penetrating effect is highly appreciated for decorative purposes.
  • the solid component of the inkjet composition contains vanadium.
  • the mechanism of the penetrating effect is associated with vanadium, which produces a lowering of the viscosity and surface tension of the melted glaze.
  • the crystalline compound of vanadium may be any of the compounds described in “A” above.
  • the frit preferably, is a fluxing frit with a composition in the following ranges as shown in Table 10 below (weight percent):
  • An inkjet composition according to the invention was prepared with the composition shown in Table 12 below (parts by weight):
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the ink is filtered throughout a 2.4 ⁇ m absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 13 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 5 g/m 2 . Once fired, the ceramic substrate exhibited a penetrating effect.
  • Applicant has also developed an inkjet composition that displays a luster effect on the substrate of the ceramic tile.
  • Luster also called contrast gloss, is the gloss associated with contrast of bright and less bright adjacent areas of the surface of an object, due to differences in refractive index between layers.
  • the solid component of the inkjet composition that displays a luster effect preferably contains tungsten. It has been found two types of formulations are suitable to produce a luster effect:
  • An inkjet composition according to the invention was prepared with the composition shown in Table 14 below (parts by weight):
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the ink is filtered throughout a 2.4 ⁇ m absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 15 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 75 g/m 2 . Once fired, the ceramic substrate exhibited a luster effect.
  • This inkjet composition is able to provide luster effect even at low deposition rates.
  • the surface shows high transparency and does not interfere with the color development of the ceramic pigments commonly used.
  • the X-ray characterization of the ceramic surface (see FIG. 2 ) showed that Scheelite crystals (CaWO4), were responsible for the luster effect.
  • Applicant has also developed an inkjet composition that displays a metallic appearance on the substrate of the ceramic tile.
  • a surface shows metallic appearance when the specular reflection is dominant over the diffuse reflection.
  • the metallic appearance may be obtained with an inkjet composition that contains the inorganic components that, after firing, generate a crystallization responsible for this effect.
  • the solid component of such an inkjet composition is ferric phosphate.
  • a combination of ferric phosphate and a frit with high content of phosphorus may be used.
  • the composition of the frit may be as shown in Table 16 below (weight percent):
  • An inkjet composition according to the invention was prepared with the composition shown in Table 17 below (parts by weight):
  • the inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 ⁇ m.
  • the ink is filtered throughout a 2.4 ⁇ m absolute filter.
  • the inkjet composition exhibited the physical properties listed in Table 18 below:
  • the inkjet composition was deposited on a ceramic substrate at a rate of approximately 75 g/m 2 . Once fired, the ceramic substrate exhibited a metallic effect.

Abstract

Inkjet compositions that can be applied to glass and/or ceramic substrates to impart various effect to the substrate after firing, including: gloss, matt, contrast gloss (luster), specular reflection (metallic appearance), relief and slipperiness. The inkjet compositions include solvents, additives for dispersion, and inorganic substances, but preferably do not include any color-producing ceramic pigments. The inorganic substances contained in the inkjet compositions are the responsible for the above mentioned effects on the surface of the ceramic article. Depending on the type of effect desired, the inorganic substance may be a specific frit, a crystalline oxide, or a combination of frits and crystalline oxides.

Description

    BACKGROUND OF INVENTION
  • 1. Field of Invention
  • The present invention provides inkjet compositions that can be used to modify the physical properties of the surface of glass and ceramic substrates and thus provide a functional coating or glaze after firing.
  • 2. Description of Related Art
  • It is conventional to apply colorants to ceramic substrates for decoration, and to apply glazes to obtain surface appearance effects. In recent years, much effort has been expended to obtain colorants that can be applied using inkjet application equipment. While these color-producing inks are suitable for their intended purpose, it would be advantageous if there were inkjet compositions that could be applied using conventional inkjet equipment to modify the appearance of the ceramic tile, while not interfering with the color development.
    • BRIEF SUMMARY OF THE INVENTION
  • The present invention provides inkjet compositions that can be used to modify the physical properties of the surface of glass and ceramic substrates and thus provide a functional coating or glaze after firing. The physical properties of the ceramic article that can be changed or modified with the inkjet compositions of the present invention can affect various attributes of the ceramic article after firing, including: gloss, matt, contrast gloss (luster), specular reflection (metallic appearance), relief and slipperiness.
  • The inkjet compositions according to the invention include solvents, additives for dispersion, and inorganic substances. The inorganic substances contained in the inkjet compositions are the responsible for the above mentioned effects on the surface of the ceramic article. Depending on the type of effect desired, the inorganic substance may be a specific frit, a crystalline oxide, or a combination of frits and crystalline oxides.
  • The inkjet compositions of the present invention may be used in conjunction with a variety of substrates including, for example: ceramic tiles (e.g., floor tile, wall tile etc.); dinnerware; brick tiles; glass; enameled steel; enameled cast iron; and enameled aluminum.
  • The foregoing and other features of the invention are hereinafter more fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the present invention may be employed.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a chart showing various inkjet technologies suitable for use with inkjet compositions according to the invention.
  • FIG. 2 is a graph showing the X-ray characterization of a ceramic tile to which an ink composition according to the invention has been applied.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • Inkjet compositions according to the invention can be applied using inkjet decoration machines commonly used glazing lines of the above mentioned substrates. Also, inkjet plotter machines are commercially available, which permit the inkjet compositions to be used in a discontinuous way.
  • Inkjet machines may be used in simple-pass or multi-pass operating mode. In the simple-pass mode, the inkjet print head makes only one-pass over the surface of the substrate. In the multi-pass mode, the inkjet print head makes more than one-pass over the surface of the substrate. In some cases, several passes are needed on order to achieve the desired properties.
  • Many known types of inkjet print head technologies are suitable for use with inkjet compositions according to the present invention. Drop-on-demand technology is the most commonly employed technology in the ceramic industry. Various inkjet technologies suitable for use with the present invention are shown in FIG. 1.
  • Conventional inkjet compositions currently used on ceramic substrates, which are sometimes referred to in the art as “inks”, are utilized to provide coloration to the ceramic substrate when fired. For this purpose, conventional inkjet inks include solvents, dispersants and color-producing substances, which are typically ceramic pigments. The current ceramic pigments used in inkjet inks include zircon praseodymium yellow zircon, zinc iron chromite brown, cobalt aluminate blue, chrome tin pink sphene, iron cobalt chromite black spinel, etc.
  • In contrast with the above mentioned inkjet inks, the inkjet compositions according to the present invention preferably do not contain any color-producing ceramic pigments. Instead, they contain inorganic substances that, although milled below 10 micron size so as to be capable of being ink-jet printable and being applied as very low deposits, are applied to modify targeted physical properties of the ceramic surface on which they are applied. Modification of the physical properties of the ceramic substrate can affect various attributes of the ceramic article after firing, including: gloss, matt, contrast gloss (luster), specular reflection (metallic appearance), relief and slipperiness.
  • The use of inkjet technology provides the advantage of being able to apply the inkjet compositions in a determined place with high accuracy. So, the change of physical properties of the surface of the tile may follow an accurate pattern, opening new possibilities for tile decoration. It is seen as an advantage to combine the application of inkjet compositions according to the invention with the conventional pigmented inkjet inks. In this way, the ceramic article may be fully decorated using inkjet technology.
  • One object of the present invention is to develop a set of inkjet compositions having a completely distinct nature compared to current pigmented inkjet inks. Inkjet compositions according to the invention are capable of being applied using conventional inkjet printing equipment without clogging the spray nozzles. Thus, the preferable have appropriate physical properties, such as a viscosity within the range of from about 5 to about 50 mPa·s, a surface tension of from about 20 to about 40 mN/m, and a density of from about 0.8 to about 1.5 g/mL. Advantageously, the inkjet compositions according to the invention preferably exhibit little or no volatility, and are stable with the materials used to make inkjet printing systems (e.g., print heads, nozzles, delivery lines etc.).
  • In addition, it is advantageous for the inkjet compositions according to the invention to work with the requirements of ceramic systems. For example, they must be capable of developing the desired surface affect (i.e., the desired physical surface change) after firing. The must be capable of interacting with the glazed surface to become part of it. They must contain sufficient solids to allow reasonable productivity. And, they must allow for enough resolution despite the large amount to be deposited.
  • The quantity of the inkjet compositions according to the invention deposited on the surface of the ceramic substrate will depend on the type of effect desired. The inkjet compositions according to the invention can be applied over a wide range of application rates, from about 5 up to about 500 g/m2, depending upon the desired affect. Typical application rates are used in the Examples below.
  • Several affects can be obtained using the disclosed inkjet compositions. The affects are provided mainly by the presence of a particular solid in the inkjet composition. The inkjet composition contains a solvent or diluent, a dispersant and the solid that creates the effect.
  • According to the present invention, the solid is dispersed in a solvent or diluent wherein the diluent is a single phase liquid comprising several solvents. This diluent can comprise aliphatic and/or aromatic hydrocarbon components as well as glycols, glycolethers, ethers, esters, alcohols, amides and/or water. In general, the diluent should have a boiling point of at least 100° C., and preferably at least 200° C. The diluent, as only one component or a combination of several ones, greatly determines the surface tension of the final ink, and thus it should have a surface tension within the print head requirements.
  • It is often necessary to include a dispersant to effectively disperse the solid particles into the diluent and stabilize the dispersion. The dispersant must be capable of helping the process of grinding and stabilizing a dispersion of the solid in the required concentration into the chosen diluent at least under the operating conditions of the printing. Polymeric dispersants are preferred because of their efficiency. Examples of suitable dispersant are polyester amine dispersants (e.g. those sold by Lubrizol under the trade name of SOLSPERSE). Examples of other dispersants that may be used are those marketed under the names EFKA and DISPERBYK. Mixtures of dispersants may be used if desired.
  • For a given combination of diluent, dispersant and solid, the appropriate amount of dispersant may readily be determined by experiment. The ideal amount of dispersant is typically that which gives the minimum viscosity of the dispersion. The suitable amount of dispersant(s) varies depending on the specific surface area and the nature of the solid and will be found to lie in a very broad range, e.g. from about 5 to about 100% by weight of solid; larger amount of dispersant may be possible as well.
  • The viscosity is determined largely by the viscosity of the diluent and the nature and concentration of the dispersant and solid. Generally, the typical viscosity range is from about 5 to about 50 mPa s, measured at the temperature of jetting.
  • The dispersant is dissolved into the diluent and then the solid is added with stirring. After good dispersion is obtained, this slurry is milled using a conventional horizontal bead mill until the appropriate particle size distribution is obtained. The product is filtered to ensure that there is no coarse material or large agglomerates in the final suspension or inkjet composition.
  • The following examples are intended only to illustrate the invention and should not be construed as imposing limitations upon the claims.
    • EXAMPLE 1
  • An inkjet composition according to the invention has been developed to provide a matt effect when fired on the ceramic tile. The solid component is a recently developed frit, which develops a matt effect (hereinafter sometimes referred to as a “matt frit”). The composition of the matt frit is shown in Table 1 below (weight percent):
  • TABLE 1
    Al2O3 30-40%
    SiO2 40-60%
    MgO 10-20%
  • The matt frit, once fired, exhibits a high resistance to chemical and physical attack. It also exhibits a high softening point. This allows the matt frit to not be attacked by conventional glazes, and the matt effect remains, essentially floating on the surface of the glazed tile. Decorative effects such as 3-D effects can thus be obtained. Furthermore, the matt frit does not modify substantially the color development of conventional ceramic pigment-containing inkjet inks.
  • An inkjet composition was been prepared with the composition shown in Table 2 below (parts by weight):
  • TABLE 2
    Solid Matt frit 38.5 parts
    Dispersant SOLSPERSE 13940  7.7 parts
    Diluent Ruetasolv ZE-5050 45.8 parts
    Butyl diglyme  8.1 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The inkjet composition was filtered throughout a 2.4 pm absolute filter. The inkjet composition exhibited the physical properties listed in Table 3 below:
  • TABLE 3
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 25.0
    Density (g/mL) 25.0 1.303
    Surface tension (mN/m) 25.0 32.9
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 10 g/m2. Once fired, the ceramic substrate exhibited a matt effect.
    • EXAMPLE 2
  • Applicant has also developed an inkjet composition that provides a gloss effect when fired on the ceramic tile. The solid component of the inkjet composition is a frit, which develops a glossy surfaces on ceramic tiles (hereinafter sometimes referred to as a “gloss frit”). The composition of the gloss frit is shown in Table 4 below (weight percent):
  • TABLE 4
    SiO2 50-60% 
    B2O3 2-8%
    Al2O3 3-11% 
    PbO 0-5%
    ZnO 2-8%
    BaO 1-5%
    MgO 0-2%
    CaO 5-15% 
    Na2O, K2O 2-10% 
  • The gloss frit exhibits a low softening point, and does not produce surface defects on glazed ceramic surfaces, such as pinholes or bubbles, which are commonly associated with the use of excess flux. It does not substantially modify the color development of the conventional ceramic pigment-containing inkjet inks.
  • An inkjet composition according to the invention was prepared with the composition shown in Table 5 below (parts by weight):
  • TABLE 5
    Solid Glossy frit 38.9 parts
    Dispersant SOLSPERSE 13940  7.8 parts
    Diluent Ruetasolv BP-4103 40.0 parts
    Butyl diglyme 13.0 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The ink is filtered throughout a 2.4 μm absolute filter. The inkjet composition exhibited the physical properties listed in Table 6 below:
  • TABLE 6
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 27.5
    Density (g/mL) 25.0 1.300
    Surface tension (mN/m) 25.0 32.7
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 100 g/m2. Once fired, the ceramic substrate exhibited a glossy effect.
    • EXAMPLE 3
  • Applicant has also developed an inkjet composition that provides an anti-slip effect when fired on the ceramic tile. The solid component of the inkjet composition comprises both a highly sintered a-alumina a glass frit. The crystals of highly sintered a-alumina are believed to be responsible for the high slip resistance. And the glass frit is needed to provide proper bonding of the a-alumina crystals to the surface of the tile after firing. An example of frit that can be used is the matt frit previously described above.
  • An inkjet composition according to the invention was prepared with the composition shown in Table 7 below (parts by weight):
  • TABLE 7
    Solid Sintered α-alumina 37.1 parts
    Matt frit  4.1 parts
    Dispersant SOLSPERSE 13940  7.4 parts
    diluents Ruetasolv BP-4201 34.8 parts
    Ruetasolv BP-4103  4.9 parts
    Exxsol D140 11.6 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The ink is filtered throughout a 2.4 μm absolute filter. The inkjet composition exhibited the physical properties listed in Table 8 below:
  • TABLE 8
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 25.5
    Density (g/mL) 25.0 1.273
    Surface tension (mN/m) 25.0 31.6
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 100 g/m2. Once fired, the ceramic substrate exhibited high slip resistance, when applied over a glossy glaze or a matt glaze. It also exhibited a smooth surface, high transparency, high acid resistance and did not substantially modify the color development of conventional ceramic pigment-containing inkjet inks.
  • Table 9 below summarizes the results of slip-resistance, acid resistance, and surface abrasion resistance of anti-slip ink compositions applied to matt and glossy glazes:
  • TABLE 9
    Surface abrasion
    Slip resistance Acid resistance resistance
    according to ENV according to EN- according to EN-
    12633 ISO 10545-13 ISO 10545-7
    Glaze Rd KIND Acid Resistance PEI
    Matt Glaze
    15 0 GHA V
    (control)
    Matt Glaze + 47 3 GHA V
    Anti-Slip
    Inkjet
    Composition
    Glossy Glaze
    10 0 — —
    (control)
    Glossy Glaze + 36 2 GHA V
    Anti-Slip
    Inkjet
    Composition
    • EXAMPLE 4
  • Applicant has also developed an inkjet composition that provides a penetrating effect when fired on the ceramic tile. The following inkjet composition made in accordance with the present invention displays a penetrating effect on the surface of the ceramic tile after firing. The penetrating effect consists of a local depression of the surface of the ceramic tile. This penetrating effect is highly appreciated for decorative purposes.
  • The solid component of the inkjet composition contains vanadium. The mechanism of the penetrating effect is associated with vanadium, which produces a lowering of the viscosity and surface tension of the melted glaze.
  • It has been found three types of formulations provide this effect, namely:
      • A. Formulations based on crystalline compounds of vanadium, like vanadium pentoxide, vanadium tetraoxide, sodium vanadate, bismuth vanadate, etc.
      • B. A combination of crystalline compounds of vanadium and a frit.
  • The crystalline compound of vanadium may be any of the compounds described in “A” above. The frit, preferably, is a fluxing frit with a composition in the following ranges as shown in Table 10 below (weight percent):
  • TABLE 10
    SiO2 31-41%
    PbO 55-65%
    Al2O3  1-5%
    Na2O, K2O  0-2%
      • C. Formulation based on a vanadium containing frit, with a composition shown in Table 11 below (weight percent):
  • TABLE 11
    SiO2 40-60% 
    B2O3 5-20%
    Na2O, K2O 5-20%
    Li2O  0-5%
    V2O5 5-25%
  • An inkjet composition according to the invention was prepared with the composition shown in Table 12 below (parts by weight):
  • TABLE 12
    Solid BiVO4 33.7 parts
    Dispersant SOLSPERSE 13940  6.1 parts
    Diluent Ruetasolv BP-4201 22.7 parts
    Ruetasolv BP-4103 27.4 parts
    Exxsol D140 10.1 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The ink is filtered throughout a 2.4 μm absolute filter. The inkjet composition exhibited the physical properties listed in Table 13 below:
  • TABLE 13
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 26.8
    Density (g/mL) 25.0 1.310
    Surface tension (mN/m) 25.0 31.5
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 5 g/m2. Once fired, the ceramic substrate exhibited a penetrating effect.
    • EXAMPLE 5
  • Applicant has also developed an inkjet composition that displays a luster effect on the substrate of the ceramic tile. Luster, also called contrast gloss, is the gloss associated with contrast of bright and less bright adjacent areas of the surface of an object, due to differences in refractive index between layers.
  • The solid component of the inkjet composition that displays a luster effect preferably contains tungsten. It has been found two types of formulations are suitable to produce a luster effect:
      • A. Formulations based on tungsten compounds like tungsten oxide, calcium tungstate, metallic tungsten, etc.
      • B. Formulations based on a combination of a tungsten compound and a frit. The tungsten compound may be any of the compounds formerly described in “A” above. The frit is preferably a glossy frit, such as the gloss frit formerly described herein.
  • An inkjet composition according to the invention was prepared with the composition shown in Table 14 below (parts by weight):
  • TABLE 14
    Solid WO3 40.5 parts
    Dispersant SOLSPERSE 13940  7.3 parts
    Diluent Ruetasolv BP-4201 13.7 parts
    Ruetasolv BP-4103 26.1 parts
    Exxsol D140 12.4 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The ink is filtered throughout a 2.4 μm absolute filter. The inkjet composition exhibited the physical properties listed in Table 15 below:
  • TABLE 15
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 33.0
    Density (g/mL) 25.0 1.497
    Surface tension (mN/m) 25.0 32.0
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 75 g/m2. Once fired, the ceramic substrate exhibited a luster effect.
  • This inkjet composition is able to provide luster effect even at low deposition rates. At the same time, the surface shows high transparency and does not interfere with the color development of the ceramic pigments commonly used. The X-ray characterization of the ceramic surface (see FIG. 2) showed that Scheelite crystals (CaWO4), were responsible for the luster effect.
    • EXAMPLE 6
  • Applicant has also developed an inkjet composition that displays a metallic appearance on the substrate of the ceramic tile. A surface shows metallic appearance when the specular reflection is dominant over the diffuse reflection. The metallic appearance may be obtained with an inkjet composition that contains the inorganic components that, after firing, generate a crystallization responsible for this effect.
  • The solid component of such an inkjet composition is ferric phosphate. Also, a combination of ferric phosphate and a frit with high content of phosphorus may be used. The composition of the frit may be as shown in Table 16 below (weight percent):
  • TABLE 16
    SiO2 30-45% 
    Al2O3 5-20%
    P2O5 10-30% 
    Li2O3  1-4%
    Na2O, K2O 5-15%
    CaO/MgO 5-15%
  • An inkjet composition according to the invention was prepared with the composition shown in Table 17 below (parts by weight):
  • TABLE 17
    Solid FePO4 33.9 parts
    Dispersant SOLSPERSE 28000  8.8 parts
    Diluent Ruetasolv BP-4103 38.7 parts
    Butyl diglyme 18.6 parts
  • The inkjet composition was milled until a final fineness was obtained such that the 99th percentile (d99) was 2 μm. The ink is filtered throughout a 2.4 μm absolute filter. The inkjet composition exhibited the physical properties listed in Table 18 below:
  • TABLE 18
    Property T (° C.) Value
    Viscosity (mPa · s) 25.0 27.4
    Density (g/mL) 25.0 1.197
    Surface tension (mN/m) 25.0 30.5
  • The inkjet composition was deposited on a ceramic substrate at a rate of approximately 75 g/m2. Once fired, the ceramic substrate exhibited a metallic effect.
  • Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and illustrative examples shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

Claims (23)

1. An inkjet composition for forming an appearance effect on a surface of a ceramic or glass substrate on which said inkjet composition is applied and fired, said inkjet composition comprising one or more solvents, one or more additives for dispersion, and one or more inorganic substances, wherein said one or more inorganic substances are non-color producing solids having a particle size not greater than about 2.4 μm.
2. The inkjet composition according to claim 1 wherein said inkjet composition has a viscosity within the range of from about 5 to about 50 mPa·s, a surface tension of from about 20 to about 40 mN/m, and a density of from about 0.8 to about 1.5 g/mL.
3. The inkjet composition according to claim 1 wherein the appearance effect is a matt effect.
4. The inkjet composition according to claim 3 wherein the non-color producing solids comprise a glass frit comprising, by weight, from about 30% to about 40% Al2O3, from about 40% to about 60% SiO2 and from about 10% to about 20% by weight MgO.
5. The inkjet composition according to claim 1 wherein the appearance effect is a gloss effect.
6. The inkjet composition according to claim 5 wherein the non-color producing solids comprise a glass frit comprising, by weight, from about 50% to about 60% SiO2, from about 2% to about 8% B2O3, from about 3% to about 11% Al2O3, optionally PbO in an amount not to exceed about 5%, from about 2% to about 8% ZnO, from about 1% to about 5% BaO, optionally MgO in an amount not to exceed about 2%, from about 5% to about 15% CaO and from about 2% to about 10% of Na2O+K2O.
7. The inkjet composition according to claim 1 wherein the appearance effect is an anti-slip effect.
8. The inkjet composition according to claim 7 wherein the non-color producing solids comprise both a-alumina a glass frit.
9. The inkjet composition according to claim 8 wherein the glass frit comprises, by weight, from about 30% to about 40% Al2O3, from about 40% to about 60% SiO2 and from about 10% to about 20% by weight MgO.
10. The inkjet composition according to claim 1 wherein the appearance effect is a penetrating effect.
11. The inkjet composition according to claim 10 wherein the non-color producing solids comprise a vanadium compound.
12. The inkjet composition according to claim 11 wherein the vanadium compound is one or more selected from the group consisting of vanadium pentoxide, vanadium tetraoxide, sodium vanadate and bismuth vanadate.
13. The inkjet composition according to claim 10 wherein the non-color producing solids comprise a vanadium compound in combination with a glass frit.
14. The inkjet composition according to claim 13 wherein the vanadium compound is one or more selected from the group consisting of vanadium pentoxide, vanadium tetraoxide, sodium vanadate and bismuth vanadate.
15. The inkjet composition according to claim 13 wherein the glass frit is a fluxing glass frit.
16. The inkjet composition according to claim 15 wherein the fluxing glass frit comprises, by weight, from about 31% to about 41% SiO2, from about 55% to about 65% PbO, from about 1% to about 5% Al2O3, and optionally Na2O+K2O in an amount not to exceed 2%.
17. The inkjet composition according to claim 10 wherein the non-color producing solids comprise a vanadium-containing frit.
18. The inkjet composition according to claim 17 wherein the vanadium-containing frit comprises, by weight, from about 40% to about 60% SiO2, from about 5% to about 20% B2O3, from about 5% to about 20% Na2O+K2O, optionally Li2O in an amount not to exceed 5%, and from about 5% to about 25% V2O5.
19. The inkjet composition according to claim 1 wherein the appearance effect is a luster effect.
20. The inkjet composition according to claim 19 wherein the non-color producing solids comprise tungsten.
21.-28. (canceled)
29. A method for forming an appearance effect on a surface of a ceramic or glass substrate, the method comprising:
applying, via inkjet printing, an inkjet composition according to claim 1 to a glaze coating applied to the surface of the ceramic or glass substrate; and
firing the inkjet composition and the glaze coating to produce the appearance effect.
30. The method according to claim 29, wherein the appearance effect is selected from the group consisting of a matt effect, a gloss effect, an anti-slip effect, a penetrating effect, a luster effect and a metallic effect.
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